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| image title | Aneroid barometer |
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| caption | This barometer uses a sealed can shaped like a short fat cylinder. The top and bottom ends have circular ridges that enable the can to expand and contract as the pressure of the air surrounding it decreases or increases. A lever mechanism translates the small changes in the volume of the sealed enclosure into movement of a pointer against a circular dial. In this example, the dial is calibrated in hPa. The mechanism is designed to be slightly stiff, so that the pointer moves more readily when the barometer is tapped and it is easier to see whether the pressure is increasing or decreasing. See also Mercury barometer, MI009. |
| code | MI010 |
| Section | Meteorological instruments |
| Subsection | Surface-based instruments |
| image credit | courtesy Royal Meteorological Society |
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